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rule win_mgbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.mgbot." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.mgbot" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { 5e c20400 ff742408 ff742408 e8???????? } // n = 5, score = 200 // 5e | pop esi // c20400 | ret 4 // ff742408 | push dword ptr [esp + 8] // ff742408 | push dword ptr [esp + 8] // e8???????? | $sequence_1 = { 8be5 5d c20800 6808020000 e8???????? } // n = 5, score = 200 // 8be5 | mov esp, ebp // 5d | pop ebp // c20800 | ret 8 // 6808020000 | push 0x208 // e8???????? | $sequence_2 = { 6808020000 e8???????? 6804010000 8bf0 6a00 56 e8???????? } // n = 7, score = 200 // 6808020000 | push 0x208 // e8???????? | // 6804010000 | push 0x104 // 8bf0 | mov esi, eax // 6a00 | push 0 // 56 | push esi // e8???????? | $sequence_3 = { 5d c20800 6808020000 e8???????? } // n = 4, score = 200 // 5d | pop ebp // c20800 | ret 8 // 6808020000 | push 0x208 // e8???????? | $sequence_4 = { 6808020000 e8???????? 6804010000 8bf0 } // n = 4, score = 200 // 6808020000 | push 0x208 // e8???????? | // 6804010000 | push 0x104 // 8bf0 | mov esi, eax $sequence_5 = { 5b 8be5 5d c20800 6808020000 e8???????? } // n = 6, score = 200 // 5b | pop ebx // 8be5 | mov esp, ebp // 5d | pop ebp // c20800 | ret 8 // 6808020000 | push 0x208 // e8???????? | $sequence_6 = { 5b 8be5 5d c20800 6808020000 } // n = 5, score = 200 // 5b | pop ebx // 8be5 | mov esp, ebp // 5d | pop ebp // c20800 | ret 8 // 6808020000 | push 0x208 $sequence_7 = { 6808020000 e8???????? 6804010000 8bf0 6a00 } // n = 5, score = 200 // 6808020000 | push 0x208 // e8???????? | // 6804010000 | push 0x104 // 8bf0 | mov esi, eax // 6a00 | push 0 $sequence_8 = { 8be5 5d c20800 6808020000 } // n = 4, score = 200 // 8be5 | mov esp, ebp // 5d | pop ebp // c20800 | ret 8 // 6808020000 | push 0x208 $sequence_9 = { 6808020000 e8???????? 6804010000 8bf0 6a00 56 } // n = 6, score = 200 // 6808020000 | push 0x208 // e8???????? | // 6804010000 | push 0x104 // 8bf0 | mov esi, eax // 6a00 | push 0 // 56 | push esi condition: 7 of them and filesize < 1677312 }
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